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When measuring piston ring end gaps, if the clearance is too small, dressing the butt ends of the rings with a hand file is a viable solution. The reason this approach is effective lies in its ability to increase the end gap, allowing for proper piston ring operation.

Piston rings are designed to expand slightly when heated, and if the end gap is insufficient, it can lead to excessive pressure buildup within the combustion chamber, potentially causing ring damage or failure over time. By filing down the ends of the rings, you can create the necessary clearance that allows for expansion without restriction, ensuring the effective sealing performance of the rings during operation.

While replacing the rings may also create the correct gap, it is often more practical and economical to adjust the current rings, provided they are still in good condition. Simply soaking them in oil or leaving them as they are does not effectively address the issue of insufficient clearance and would not resolve the potential problems associated with a too-tight end gap.